4 mages, all fire, all frost, or a mix?

[Kruschpakx4]

wouldnt fire/frost be a better aoe spec since blastwave/arcane explosion can shatter? or can only 1 mage benefit from it until frostnova would break immediately

[Peregrine]

Shatter breaks but you can always rotate nova with arcane explosion. Works at that particular time so if you got 4x mage casting arcane explosion at frozen target it will crit all 4 at same time if cast at same time.